Regulator system



Sept. 28 1926. 1,601,317

W. G. MYLIUS REGULATOR SYSTEM Filed June 5, 1922 WITNESSES: I INVENTOR WaITer G. Nyh'us.

Patented Sept. 28', 192 6.

UNITED STATES PATENT OFFICE.

WALTER G. MYLIUS, O]? WILKINSBURG, PENNSYLVANIA, ASSIGNOB TO WESTING- HOUSE ELECTBIC & MANUFACTURING COMPANY, A CORPORATION 01 PENNSYL- VANIA.

REGULATOR SYSTEM.

Application tiled June 5, 1922. Serial No. 566,063.-

My invention relates to regulator systems and it has special relation to a load-regulating system. 7

' One object of my invention is to provide a system of the above-indicated character that shall function to maintain a substantially constant load upon a dynamo-electric machine.

Another object of my invention is to provide a system of the above-indicated character for a motor that is operated from a power circuit feeding other variable load apparatus, and so governing the operation of said motor that the load taken thereby shall not exceed a predetermined maximum demand upon the power circuit.

Another object of my invention is to provide a system of the above-indicated character that comprises a motor operated from a power circuit supplying other variable load apparatus, and regulating the operation of said motor so that it will utilize only that power not consumedby the other variable load apparatus, within a predetermined limit.

Briefly, the system comprises a pulp grinder, operated by a motor that is connected to a power circuit which feeds the apparatus for the entire mill. The load upon the pulp grinder is capable of being regulated so as to maintain the load thereupon substantially constant.

The mill operator may purchase a particular amount of power for which he pays a minimum rate. It, therefore, becomes important that the mill should not consume more than the maximum amount ofpower to be obtained at the minimum rate. It is not essential that the pulp grinders function to full-load capacity continuously, so that the present invention contemplates providing additional regulating apparatus energized from the power circuit and adapted to control the setting of the load regulator for the pulp grinder motor so that the pulp grinder motor will consume only as much power within said minimum-rate schedule as is not consumed by the remainder of the mill load. Or, in the event of the mill load being low, the load-regulating apparatus will merely maintain a predetermined full load upon the pulp grinder motor, regardless of the power available for the operation of the motor. Anti-hunting means is provided for each of the regulating apparatus.

My invention will be best understood from the accompanying drawing, wherein the single figure is a diagrammatic view of the cirguits and apparatus embodying my inven- A (pulp grinder l is adapted to be operate by a motor 2 that is connected to a power circuit comprising conductors 3, 4 and 5. This power circuit is the principal feeder for the entire mill, which comprises considerable equipment in addition to the pulp grinders. The load upon the pulp grinder 1 is controlled by a fluid-pressure system indicated generally at 6, the pressure of which is regulated by the operation of a. valve 7 that is raised and lowered by a motor 8, through the medium of the illus trated gearing 9. The direction of rotation of the motor 8 is controlled by means of reversing switches 11 and 12.

The switches 11 and 12 are similar in construction, so that switch 11 only will be described. This switch has an operating coil 13 and a switch arm 14 that is pivoted at 15. The arm 14 controls main contact members 16 and 17. The shaft of the motor 8 is provided with a friction brake 18 comprising pivoted members that engage the shalt of the motor and are controlled by means of the coil 19. The operating coils 13 of the Switches 11 and 12 are respectively connected to the contact members 21 and 22, and the brake coil 19 is connected to the paralleled contact members 20, the circuit through all of which is controlled by means of the regulator, 23.

The regulator 23 comprises an arm 24 that is pivoted at 25, and carries on one end thereof a weight 26. Mounted on opposite sides of the pivot 25 are electromagnets 27 and 28. These electromagnets are similar in construction and each comprises a pair of difierentially wound coils 29 that are respectively located upon the upper and lower ends of the core armature 30, and a centrally disposed coil 31. The coils 31 are energized from the potential transformer 32 that is connected across the power circuit 3, 4, 5. thereby polarizing the electromagnets 27 and 28. The coils 29 are adapted to be energized from series transformers 33 and 34, which are connected in the circuit of the motor 2 that is operating the pulp grinder 1, thereby energizing the electromagnets 27 and 28 proportional to the load taken by the motor 2. The load is measured by the watts consumed by the circuit.

The pull of the electromagnets is balanced with respect to the constant power of the weight 26, for which could be substituted a spring or other equivalent means. If the load upon the motor 2 should vary, the variation will be indicated by the value of current taken by the motor from the power circuit and, through the transformers 33 and 34, will be communicated to the electromagnets 27 and 28. The power will either be increased to overcome the action of the weight or decreased so that the weight will overcome the pull of the electromagnets. The result will be to complete the circuit through either contact member 21 or contact member 22 to the respective reversing switches 11 and 12, to operate the motor 8 in the proper direction to restore the load upon the pulp grinder to normal.

In order to prevent hunting action by the regulator, back contact members 35 and 35 are respectively provided for the reversing switches 11 and 12. The contact members 35 control a shunt circuit for a resistor 36 that is connected in circuit with the potential coils 31 of the electromagnets 27 and 28, while the contact members 35 control a circuit to a resistor 37 that is adapted to connect it in parallel circuit relation to the potential coils 31 of the electromagnets when the contact members 35 are closed. Thus, the polarization of the electromagnets will be increased or decreased as may be necessary to separate the engaged contact members prior to the obtaining of normal condi, tions.

As heretofore explained, it is desirable to confine the operation of the mill within a predeterminedt load limit for the feeder circuit, and it is not essential for the pump grinders to operate at full-load capacity continuously. Hence, the present invention contemplates controlling the setting of the regulator 23 so that the motor 2 will consume onl that portion of the power that is not required by the remainder of the mill within the load limit. The regulator 23 will then function to maintain a constant load within the power it is permitted to take, but that may not be the full-load capacity of the .pulp grinder.

A rheostat 41 is connected in parallel-circuit relation to the current coils 29 of the electromagnets 27 and 28. The arm 42 of the rheostat is operated by a motor 43, the direction of rotation of which is controlled by reversing switches 44 and 45. The reversing switches are similar in construction and operation to reversing switches 11 and 12, so that no detailed description thereof need be given. The operating coils 46 thereof are respectively in circuit with contact members 47 and 48, which are controlled by the operation of the regulator 49. The motor 43 is also provided with a brake 50, similar to brake 18 of motor 8, the o crating coil of the brake 50 being controlle b con tact members 51, which are operated y the regulator 49. The regulator 49 has an arm 51 that is pivoted at 52 and carries on one end thereof a weight 53. This weight may be changed to a spring or other means exerting a constant pull upon the arm 51. i The regulator 49 also has two electromagnets 54 and 55, disposed on opposite sides of the pivot 52 and similar in construction to the electromagnets 27 and 28, heretofore described. The electromagnets 54 and 55 cold prise differential coils 56 that are differentially disposed upon the core armature 57 and are energized from series transformers 58 and 59 that are located in the power circuit ahead of any connections for the mill apparatus. The electromagnets 54 and 55 also comprise centrally disposed voltage coils 61 that may be energized from the voltage transformer 32 so as to polarized the electromagnets 54 and 55.

If the power drawn by the mill apparatus, excluding the pulp grinders, exceeds a predetermined amount, which is still within the minimum rate load, the indication will be communicated to the electromagnets 54 and 55 from the transformers 58 and 59. The contact members 47 will be closed to energize the reversing switch 44 and operate the motor 43 to lower the energization of the coils 29 of the electromagnets 27 and 28 of the regulator 23. Thus, the polarization of these electromagnets is weakened and the regulator 23 will be caused to operate the va ve 7 to decrease the load upon the pulp grinder motor. This operation may be continued, if necessary, until the pulp grinder motor is drawing substantially no power from the power circuit.

Then, as the mill load falls off, the indication will be communicated to the regulator 49 so that the opposite set of contact members will be closed to operate the motor 43 in the opposite direction andincrease the polarization of the electromagnets 27 and 28. Thus, the regulator 23 will be caused to function to increase the load upon the pulp grinder motor. As soon as the pul rinder is consuming the maximum ermissible amount of the load in excess of t iat carried by the rcmainder of the mill, the total load still being within the minimum rate amount, the re lator 49 will return to its neutral positlon and the re lator 23 will thereafter function to maintain the load upon the pulp lator 23 will determine the maximum load,

' contact members 63 control a resistor 65 that .is alsoconnected in parallel circuit relation with the coils 61. The functioning of the antihunting operation is similar to that described for the regulator 43.

' Modifications in the system and arrangement and location of parts may be made within the spirit and scope of my invention, and such modifications are intended to be covered by the appended claims.

I claim as my invention 2-- 1. In a regulator system, the combination with a power circuit, a motor connected thereto, a variable load operated by said motor, means for controlling the amount of said load and comprising a valve and a motor for operating said valve, switches for governing the rotation of said last named motor, and means for selectively operating said switches, said selective means comprising a pair of differential electromagnets energized proportional to the load upon said first named motor, of means for determining the setting of said selective means and comprising a pair of differential electromagnets energized in accordance with the load upon said power circuit, switches controlled by said last-mentioned means and a motor-operated rheostat connected in circuit with said last-mentioned means and controlled in accordance with the operation of said last named switches.

2. In a regulator system, the combination with a power circuit, a motor energized therefrom, a variable load operated by said motor, means for controlling said load and electroresponsive means for governing said controlling means, of additional means for determining the amount of load said motor may operate, said additional means being controlled in accordance with the load upon said power circuit.

3. In a regulator system, the combination with a power circuit, a motor connected thereto, a variable load operated by said motor, a ressure system for varying the amount of sai load, and regulating means for said pressure system, of means for determinin the operation of said regulatlng means an controlled proportional to the amount of load upon said power circuit.

4:. In a regulator system, the combination with a power circuit, a dynamo-electric machine connected thereto, a variable load connected to said machine, and means for controlling the amount of said load, of additional means for also controlling the amount of said load, said additional means being governed in accordance with the load upon said power circuit. v

5. In a regulator system, the combination with a power circuit, a dynamo-electric machine connected thereto, a variable load connected to said machine, and means for controlling the amount of said load, of additional means for also controlling the amount of said load, said additional means being governed in accordance with certain electricalcharacteristics of said power circuit.

6. In a regulator system, the combination with a power circuit, a dynamo-electric machine connected thereto, a variable load connected to said machine, and means for controlling the amount of said load, of additional means for determining the setting of said regulating means, said additional means being governed in accordance with the load upon said power circuit.

7. In a regulator system, the combination with a pulp grinder, a motor for operating the same, a power circuit to which said motor is connected, a motor-operated valve for controlling the amount of load upon said pulp grinder, and regulating means for controlling the-operation of said valve to maintain substantially constant load upon said motor, of additional means for governing the setting of said regulating means and operating proportional to the load upon. said power circuit.

8. In a regulator system, the combination with a pulp grinder, a motor for operating the same, a power circuit to which said motor is connected, a motor-operated valve for controlling the amount of load upon said pulp grinder, and regulating means for controlling the operation of said valve to maintain substantially constant load upon said motor, of' additional means for governing the setting of said regulating means in accordance with variations in the load upon said power circuit, said additional means comprising a current-varying device in circuit with said regulating means.

9. In a regulator system, the combination with a pulp grinder, a motor for operating the same, a. power circuit to which said motor is connected, a motor-operated valve for controlling the amount of load upon said pulp grinder, and regulating means for con- Lil trolling the operation of said valve to maintain substantially constant load upon said motor, of additional means for governin the setting of said regulating means, said additional means comprising a current-vary ing device and electroresponsive means energized in accordance with the load upon said power circuit.

10. The combination with a power circuit and a plurality of variable load devices connected to said power circuit and adapted to operate within a predetermined power limit, of a pulp grinder, a motor for operating said grinder and connected to said power circuit, regulating means for said motor, and means formodifying the operation of said regulating means so that the total power consumed is maintained within said predetermined power limit.

11. In a regulator system, the combination with a power circuit, a motor energized therefrom, a variable load operated by said motor, means for controlling said load and electroresponsive means for governing said controlling means, of additional means for determining the amount of load upon said motor, said additional means being controlled in accordance with the load upon said power circuit, and anti-hunting means co-operating therewith.

12. Ina regulator system, the combination with a power circuit, a m otor connected thereto, a variable load operated by said motor, a pressure system for varying the amount of said load, regulating means for said pressure system, and means for preventing hunting action thereof, of means for determining the operation of said regulating means and controlled proportional to the amount of load upon said power circuit.

13. In a regulator system, the combination with a power circuit, a dynamo-electric machine connected thereto, a variable load connected to said machine, and means for controlling the amount of said load, of additional means for also controlling the amount of said load, said additional means being governed inaccordance with the watts of said power circuit, and anti-hunting means co-operating with said control means.

14. In a regulator system, the combination with a pulp grinder, a motor for operating the same, a power circuit to which ing the setting of said regulating means in accordance with variations in the load upon said power circuit, and anti-hunting means co-operating with said valve.

15. The combination with a power circuit and a plurality of variable load devices connected thereto, of a pulp grinder, a motor for operating said grinder, regulating means for said motor, means for modifying the operation of said regulating means proportional to the excess power of said power circuit beyond that consumed by said variable load devices, and anti-hunting means co-operating with said governing means.

16. In a regulator system, the combination with a power circuit, a variable load apparatus connected thereto, and a pulp grinder also operated from said power circuit, of a plurality of regulating means for controlling the operation of said pulp grinder. one of said means being normally responsive to variations in load upon said pulp grinder and the other of said means being responsive to, variations in load upon said power circuit, and anti-hunting means co-operating with said regulating means.

In testimony whereof, I have hereunto subscribed my name this 22nd day of May,

WALTER G. MYLIUS. 

